JP2022170370A - Flood prevention wall, construction method of flood prevention wall, and precast concrete wall body - Google Patents

Abstract

To provide a flood prevention wall capable of being hardly subject to land restrictions while facilitating water stoppage work, a construction method of flood prevention wall, and a precast concrete wall body.SOLUTION: A flood prevention wall 10 includes multiple waterproof blocks 20 arranged in the width direction. Each waterproof block 20 has two pairs of opposing plates 21, 22 facing in the thickness direction respectively at both ends in the width direction, and an upper plate 23 provided connecting upper ends of the respective opposing plates 21, 22. Between the opposing plates 21, 22 in each pair, an inner space 25 open at each end of the waterproof block 20 and downward is formed. A steel sheet pile 30 embedded in a ground 12 enters into the inner space 25 from the bottom. Also, the inner spaces 25 are filled with filling concrete 38 that joins the waterproof blocks 20 and the steel sheet pile 30. The filling concrete 38 is provided in and across the inner spaces 25 of the neighboring waterproof blocks 20.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flood prevention wall for preventing flooding of a building or other target to be prevented from flooding, a construction method for constructing the flood prevention wall, and a precast concrete wall constituting the flood prevention wall.

2. Description of the Related Art In recent years, buildings and the like are frequently flooded due to bursts of rivers caused by torrential rain. As a technique for preventing such buildings from being flooded, Patent Literature 1 proposes a technique for constructing a flood prevention wall surrounding a building or the like. The flood prevention wall of Patent Document 1 is constructed by arranging concrete L-shaped blocks side by side. Specifically, this L-shaped block has a bottom plate portion that extends horizontally and is installed in the ground, and a wall portion that rises upward from the bottom plate portion, and is formed to have an L-shaped cross section. In addition, in the flood prevention wall of Patent Document 1, a water stop material such as packing is interposed between adjacent L-shaped blocks, thereby preventing water from entering through the L-shaped blocks.

Japanese Patent No. 6501961

By the way, in the technique of Patent Literature 1, since the L-shaped block has a bottom plate part that is long in the depth direction, it is conceivable that the width of the land required for installing the L-shaped block is increased. Therefore, there is a problem that the construction of the flood prevention wall is likely to be subject to restrictions on the site.

When installing the L-shaped blocks, a water-stopping material is provided between adjacent L-shaped blocks, and the L-shaped blocks are installed so that the water-stopping material is sandwiched between the adjacent L-shaped blocks. There is a need. Therefore, it is necessary to pull one L-shaped block toward the other L-shaped block and position them with high accuracy, which may make water stopping work difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a flood prevention wall, a method for constructing a flood prevention wall, and a wall made of precast concrete, which are less likely to be subject to land restrictions and facilitate water stoppage work. The main purpose is to provide the body.

In order to solve the above problems, the flood prevention wall of the present invention is
A flood prevention wall that prevents flooding to a building or other target to be prevented from flooding by being erected above the ground,
Equipped with multiple walls arranged side by side in the width direction,
The wall has a pair of opposing plate portions facing each other in the thickness direction of the wall,
In-wall spaces opened at least at both ends in the width direction and downward are formed between the opposing plate portions,
a support that is driven into the ground and whose upper end side enters the wall space from below;
a solidifying material that fills the intra-wall space and binds the support and the wall,
The solidifying material is provided across the inner wall space of the adjacent wall bodies.

According to the present invention, a wall space is formed between the pair of opposed plate portions of the wall and is open at both ends in the width direction and downward. is entering from The space in the wall is filled with a solidifying material such as concrete, and the solidifying material joins the support and the wall together. In this case, since the wall can be supported by the support, the wall can be installed in a stable state without providing a bottom plate portion unlike the conventional L-shaped block (Patent Document 1). can. Therefore, it is possible to make it difficult to be subject to land restrictions.

In addition, since the solidifying material is provided across the inner wall space of the adjacent wall bodies, water can be stopped between the adjacent wall bodies by the solidifying material. In this case, by filling the space in the wall with the solidifying material at the time of construction, water stoppage between the walls can be achieved in addition to bonding between the wall and the support. Therefore, it is possible to facilitate water stoppage work.

The perspective view which shows the state in which the flood prevention wall was installed around the building. FIG. 3 is a perspective cross-sectional view showing a flood prevention wall; FIG. 4 is a longitudinal sectional view showing a flood prevention wall; (a) is a perspective view showing a waterproof block, and (b) is a longitudinal sectional view. The figure for demonstrating the construction method of a flood prevention wall.

An embodiment embodying the present invention will be described below with reference to the drawings. Note that FIG. 1 is a perspective view showing a state in which a flood prevention wall is installed around a building.

As shown in FIG. 1 , the flood prevention wall 10 is provided around the building 11 so as to rise above the ground 12 . The flood prevention wall 10 is provided in an annular shape so as to surround the building 11, for example, in a square annular shape. In this case, the inner region 13 surrounded by the water-preventing wall 10 is separated from the outer region 14 by the water-preventing wall 10 . This makes it possible to prevent water from entering the inner area 13 where the building 11 is provided from the outer area 14 in the event of flooding due to flooding or the like. Note that the building 11 corresponds to a flood prevention target.

Next, the structure of the flood prevention wall 10 will be described with reference to FIGS. 2 to 4. FIG. Note that FIG. 2 is a perspective sectional view showing the flood prevention wall 10. As shown in FIG. FIG. 3 is a longitudinal sectional view showing the flood prevention wall 10. As shown in FIG. 4A is a perspective view showing the waterproof block 20, and FIG. 4B is a longitudinal sectional view.

As shown in FIGS. 2 and 3, the flood prevention wall 10 includes a plurality of waterproof blocks 20 arranged side by side. The waterproof block 20 is a rectangular wall block made of precast concrete. The waterproof blocks 20 are arranged side by side in the width direction (hereinafter also referred to as the block width direction), and are installed with their lower portions embedded in the ground 12 . Specifically, below the waterproof block 20, a plate-shaped basic concrete 16 is provided in a state of being buried in the ground 12, and the waterproof block 20 is provided in a state of being placed on the basic concrete 16. there is Note that the waterproof block 20 corresponds to the wall.

As shown in FIGS. 2 to 4, the waterproof block 20 includes a pair of opposing plate portions 21 and 22 facing each other in the thickness direction, and an upper plate portion 23 provided by connecting the upper ends of the opposing plate portions 21 and 22. and Each of the opposing plate portions 21 and 22 is formed in a rectangular plate shape. there is Although not shown, reinforcing bars are provided inside the opposed plate portions 21 and 22 and inside the upper plate portion 23, respectively.

An inner space 25 of the waterproof block 20 is formed between the opposed plate portions 21 and 22 . The inner space 25 is open to both end sides and downward in the block width direction. In this case, the inner spaces 25 of the adjacent waterproof blocks 20 are in a continuous state. Further, the inner space 25 is covered from above by the upper plate portion 23 . Note that the inner space 25 corresponds to the wall space.

The upper plate portion 23 is provided with a plurality of (two in this embodiment) holes 27 penetrating in the thickness direction. These holes 27 are rectangular and arranged symmetrically in the block width direction. The inner space 25 is opened upward through these holes 27 .

The upper plate portion 23 has recesses 28 that are recessed inward in the same direction at both ends in the block width direction. These concave portions 28 penetrate the upper plate portion 23 in the thickness direction. At the boundary between the adjacent waterproof blocks 20, the concave portions 28 of the respective waterproof blocks 20 face each other, whereby the concave portions 28 form rectangular openings 29. As shown in FIG. As a result, the inner space 25 is opened upward through the opening 29 at the boundary between the adjacent waterproof blocks 20 .

A steel sheet pile 30 is provided below each waterproof block 20 while being driven into the ground 12 . The steel sheet pile 30 is driven into the ground 12 while penetrating the foundation concrete 16 . The steel sheet piles 30 are provided so as to extend in the direction in which the waterproof blocks 20 are arranged, and are continuously arranged across the waterproof blocks 20 . The upper end side of the steel sheet pile 30 enters the inner space 25 of the waterproof block 20 from below. In this case, the steel sheet pile 30 has its upper end set at a position lower than the ground surface. Note that the steel sheet pile 30 corresponds to a support.

A bolt 31 as a fastening member is provided on the lower end side of each of the opposed plate portions 21 and 22 of the waterproof block 20 . A bolt 31 is provided across the opposing plate portions 21 and 22 , and the opposing plate portions 21 and 22 are connected to each other via the bolt 31 . Note that the bolt 31 corresponds to an opening suppressing member.

Of the opposing plate portions 21 and 22, the opposing plate portion 21 is formed with an insertion hole portion 33 through which the bolt 31 is inserted, and the opposing plate portion 22 is formed with a screw hole portion 34 into which the bolt 31 is fastened. there is The screw hole portion 34 is a concave hole portion that is open only to the inner space 25, and has a female screw portion (not shown) formed on its inner peripheral surface. Specifically, the screw hole portion 34 is formed by inserting an insert screw having a female thread portion into a concave hole portion formed in the opposing plate portion 22 . The insertion hole portion 33 corresponds to the first hole portion, and the screw hole portion 34 corresponds to the fastening hole portion. Further, the opposing plate portion 21 corresponds to one opposing plate portion, and the opposing plate portion 22 corresponds to the other opposing plate portion.

The steel sheet pile 30 is also formed with an insertion hole 35 through which the bolt 31 is inserted. The bolt 31 is fastened to the threaded hole portion 34 of the facing plate portion 22 through the insertion hole portion 33 of the facing plate portion 21 and the insertion hole portion 35 of the steel sheet pile 30 . As a result, the opposing plate portions 21 and 22 and the steel sheet pile 30 are connected to each other via the bolts 31, and thus the waterproof block 20 and the steel sheet pile 30 are connected to each other. Note that the insertion hole portion 35 corresponds to the second hole portion.

The bolts 31 are arranged at a plurality of positions in the width direction (the same direction as the block width direction) of each of the opposed plate portions 21 and 22 . In this embodiment, the bolts 31 are arranged at three locations on each of the opposing plate portions 21 and 22. More specifically, one bolt is arranged at the central portion in the width direction of each of the opposing plate portions 21 and 22, and the remaining two bolts are arranged at each of the opposing plate portions 21 and 22. The plate portions 21 and 22 are arranged at both ends in the width direction. The opposing plate portions 21 and 22 and the steel sheet piles 30 are connected to each other via the plurality of bolts 31 . Therefore, in correspondence with the plurality of bolts 31, a plurality of insertion holes 33 are formed in the opposing plate portion 21, a plurality of insertion holes 35 are formed in the steel sheet pile 30, and a screw hole portion is formed in the opposing plate portion 22. 34 are formed. Further, each bolt 31 is arranged below the ground surface.

The inner space 25 of each waterproof block 20 is filled with filling concrete 38 . The filling concrete 38 is formed by placing it in the inner space 25 on site and then solidifying it. Therefore, the filling concrete 38 is made of cast-in-place concrete. Note that the filling concrete 38 corresponds to the solidifying material.

Filling concrete 38 fills the entire inner space 25 . In the inner space 25, the steel sheet pile 30 and the bolt 31 are buried in the filling concrete 38. As shown in FIG. In this case, the steel sheet piles 30 and the waterproof blocks 20 are connected to each other via the bolts 31 , and the steel sheet piles 30 and the waterproof blocks 20 are connected to each other by the filling concrete 38 . In addition, the filling concrete 38 is filled across the inner spaces 25 of the adjacent waterproof blocks 20 . Therefore, filling concrete 38 serves to stop water between adjacent waterproof blocks 20 .

Next, a construction method for constructing the flood prevention wall 10 will be described. FIG. 5 is a diagram for explaining such a construction method.

First, as shown in FIG. 5( a ), a steel sheet pile driving step of driving a steel sheet pile 30 into the ground 12 is performed. In this step, the steel sheet pile 30 is driven into the ground 12 using a pile driver or the like. Further, in this step, the steel sheet pile 30 is driven so that a part of the upper end side of the steel sheet pile 30 protrudes upward from the ground 12 . After the steel sheet piles 30 have been driven in, the foundation concrete 16 is driven into the ground 12 (see FIG. 5(b)). Note that the steel sheet pile driving process corresponds to the support driving process.

Next, as shown in FIG. 5B, a waterproof block installation process for installing the waterproof block 20 is performed. In this step, the waterproof block 20 is installed on the foundation concrete 16 with the upper end side of the steel sheet pile 30 inserted into the inner space 25 of the waterproof block 20 from below. When installing the waterproof block 20, the waterproof block 20 is lifted by a crane, and in that state, the waterproof block 20 is moved to an installation position and installed. At this time, for example, the installation work is performed using a backhoe with a crane. The waterproof block installation process corresponds to the wall installation process.

Next, as shown in FIG. 5(c), a connecting step of connecting the waterproof block 20 and the steel sheet pile 30 with bolts 31 is performed. In this step, first, a hole forming step is performed to form the insertion hole portion 35 through which the bolt 31 is inserted in the steel sheet pile 30 . In this step, an insertion hole 35 is formed in the steel sheet pile 30 by a drill through the insertion hole 33 of the opposing plate portion 21 of the waterproof block 20 . Subsequently, a bolt connection step of connecting the opposing plate portions 21 and 22 and the steel sheet pile 30 with the bolts 31 is performed. In this step, the bolts 31 are fastened to the screw holes 34 of the opposing plate portion 22 through the insertion holes 33 of the opposing plate portion 21 and the insertion holes 35 of the steel sheet piles 30 .

Next, as shown in FIG. 5(d), a concrete filling step is performed in which the filling concrete 38 is filled in the inner space 25 of the waterproof block 20 in a fluid state and then solidified. In this step, the filling concrete 38 is poured (placed) into the inner space 25 through the holes 27 of the waterproof block 20 in a fluid state. At this time, the filling concrete 38 is filled across the inner spaces 25 of the adjacent waterproof blocks 20 . After the filling concrete 38 is filled, the filling concrete 38 is solidified when a predetermined time elapses. As a result, the filling concrete 38 joins the waterproof blocks 20 and the steel sheet piles 30 together, and seals off water between the adjacent waterproof blocks 20 . Note that the concrete filling process corresponds to the solidifying material filling process.

Through the steps described above, the flood prevention wall 10 is constructed, and a series of operations is completed.

According to the configuration of the present embodiment described in detail above, the following excellent effects are obtained.

(1) In the waterproof block 20, an inner space 25 is formed between the pair of opposed plate portions 21 and 22 and is open at both ends in the width direction (block width direction) and downward. The upper end side of the steel sheet pile 30 which was installed was inserted from below. The inner space 25 was filled with filling concrete 38, and the filling concrete 38 connected the steel sheet pile 30 and the waterproof block 20 to each other. In this case, since the waterproof block 20 can be supported by the steel sheet pile 30, the waterproof block 20 can be installed in a stable state without providing a bottom plate portion unlike the L-shaped block of the prior art (Patent Document 1 above). can do. Therefore, it is possible to make it difficult to be subject to land restrictions.

In addition, since the filling concrete 38 is provided across the inner spaces 25 of the adjacent waterproof blocks 20, the filling concrete 38 can stop water between the adjacent waterproof blocks 20. - 特許庁In this case, by filling the inner space 25 with the filling concrete 38 at the time of construction, in addition to joining the waterproof blocks 20 and the steel sheet piles 30, water stoppage between the waterproof blocks 20 can be performed. Therefore, it is possible to facilitate water stoppage work.

(2) Since the steel sheet piles 30 are used as supports for supporting the waterproof blocks 20 , a continuous wall portion can be constructed by the steel sheet piles 30 in the ground 12 below the waterproof blocks 20 . As a result, it is possible to prevent water from flowing into the building 11 through the ground 12 under the wall when flooded.

(3) Since the waterproof block 20 is configured to include the upper plate portion 23 that connects the pair of opposing plate portions 21 and 22 on the upper end side, the insertion route of the steel sheet pile 30 into the inner space 25 is secured, and the pair of The strength of the waterproof block 20 including the opposing plate portions 21 and 22 can be increased.

(4) The upper plate portions 23 of the adjacent waterproof blocks 20 are formed so that the openings 29 that open the inner space 25 upward are formed at the boundaries of the adjacent waterproof blocks 20 . Specifically, recesses 28 are formed at both ends of the upper plate portion 23 in the block width direction, and the recesses 28 face each other at the boundaries of the adjacent waterproof blocks 20 so that the openings 29 are formed. did. In this case, when the inner space 25 is filled with the filling concrete 38 , the air inside the inner space 25 can be removed through the opening 29 . Therefore, it is possible to prevent insufficient filling of the filling concrete 38 due to accumulation of air in the inner space 25 at the boundary between the adjacent waterproof blocks 20 . As a result, it is possible to suppress the deterioration of the water stoppage between the adjacent waterproof blocks 20 .

Also, when filling the inner space 25 with the filling concrete 38 , it is possible to confirm through the opening 29 whether the filling concrete 38 is sufficiently filled at the boundaries of the adjacent waterproof blocks 20 . Therefore, it is also convenient for securing water cutoff between the adjacent waterproof blocks 20 .

(5) In the waterproof block 20 having the inner space 25 opened downward, when the filling concrete 38 is filled into the inner space 25, the opposed plate portions 21 and 22 are pushed outward and opened by the filling pressure. can be considered. In that case, for example, only the opposing plate portions 21 and 22 of one waterproof block 20 among the adjacent waterproof blocks 20 may open, thereby creating a gap between the adjacent opposing plate portions 21 and 22 . If this happens, the filling concrete 38 may leak from the gaps, and filling failure of the filling concrete 38 may occur at the boundary between the adjacent waterproof blocks 20, resulting in a decrease in water cutoff performance.

Therefore, in the above-described embodiment, in view of such a point, each waterproof block 20 is provided with an opening suppressing member that suppresses opening of the opposing plate portions 21 and 22 to the side away from each other when the filling concrete 38 is filled. is provided. Specifically, a bolt 31 that connects the opposed plate portions 21 and 22 is provided as an opening suppressing member. As a result, it is possible to suppress the opening of the opposing plate portions 21 and 22 when the filling concrete 38 is filled, so that it is possible to suppress the deterioration of the water stoppage due to the opening of the opposing plate portions 21 and 22 .

(6) The bolt 31 is fastened to the threaded hole portion 34 of the opposing plate portion 22 through the insertion hole portion 33 of the opposing plate portion 21 and the insertion hole portion 35 of the steel sheet pile 30. The opening of the opposing plate portions 21 and 22 is suppressed. In such a configuration, the opposing plate portions 21 and 22 and the steel sheet pile 30 are connected to each other via the bolts 31, and the filling concrete 38 is filled in the connected state, so that the waterproof block 20 and the steel sheet pile 30 are further separated. It can be strongly bonded.

(7) The opposing plate portion 22 is provided facing the outer region 14 , and the concave screw hole portion 34 opened only to the inner space 25 is provided in the opposing plate portion 22 . As a result, in the above-described configuration in which opening of the opposing plate portions 21 and 22 is suppressed by connecting the opposing plate portions 21 and 22 with the bolts 31, water flows to the building 11 side through the surroundings of the bolts 31 when flooded. You can definitely avoid getting in.

(8) Since the bolts 31 are provided at a plurality of locations in the width direction of the waterproof block 20, the steel sheet piles 30 extending in the width direction and the waterproof block 20 can be firmly connected. In addition, since the bolts 31 are arranged on both widthwise end sides of each of the opposed plate portions 21 and 22 , it is possible to suppress opening of both end sides of each of the opposed plate portions 21 and 22 when the filling concrete 38 is filled. As a result, one of the adjacent opposing plate portions 21 and 22 of the adjacent waterproof blocks 20 opens, creating a gap between the opposing plate portions 21 and 22, causing the above-described inconvenience (see (5) above). can be suitably suppressed.

(9) Since the waterproof block 20 is formed in a hollow shape having the inner space 25, the weight of the waterproof block 20 can be reduced, and the installation work of the waterproof block 20 can be facilitated. For example, it is possible to lift and install the waterproof block 20 using a backhoe with a crane.

The present invention is not limited to the above embodiments, and may be implemented as follows, for example.

- In the above-described embodiment, the waterproof block 20 as the wall is made of precast concrete having the opposed plate portions 21 and 22 and the upper plate portion 23, but the structure of the wall is not necessarily limited to this. For example, the wall may have a pair of separate precast concrete facing plates and a connecting member that connects the facing plates while being spaced apart from each other. In this case, a fastening member such as a bolt can be considered as the connecting member. In the wall body having such a configuration, an intra-wall space is also formed between the pair of opposing plate portions. Therefore, the wall is installed with the steel sheet piles 30 inserted into the wall space from below, and then the wall space is filled with filling concrete 38 to construct a flood prevention wall.

In the above-described embodiment, the opposing plate portion 22 is formed with the threaded hole portion 34 through which the bolt 31 is fastened. In addition, a nut to be fastened with the bolt 31 may be provided on the outer surface side of the opposing plate portion 22 . In this case, the bolt 31 is fastened to the nut through the respective insertion holes 33 and 35 of the facing plate portion 21 and the steel sheet pile 30 . In this case, the nut corresponds to the member to be fastened.

- In the above embodiment, the bolt 31 is used as the fastening member, but other fastening members such as screws may be used.
- In the above-described embodiment, the bolts 31 are used to suppress the opening of the opposing plate portions 21 and 22 when filling the filling concrete 38, but members other than the bolts 31 are used to suppress such opening. may For example, it is conceivable to use a U-shaped clamping member that clamps the opposing plate portions 21 and 22 . In this case, the sandwiching member is fitted from below the opposing plate portions 21 and 22 such that the opposing plate portions 21 and 22 are inserted inside the holding member. This configuration also makes it possible to suppress the opening of the opposing plate portions 21 and 22 . Also, in this case, the clamping member is preferably attached to the waterproof block 20 in advance at the factory.

- In the above-described embodiment, the steel sheet pile 30 is used as a support for supporting the waterproof block 20 in a state of being driven into the ground 12, but as such a support, a pile or the like other than the steel sheet pile 30 may be used. .

- In the above embodiment, the waterproof block 20 is made of concrete, but it may be made of resin or metal.

- In the above embodiment, the inner space 25 of the waterproof block 20 is filled with the filling concrete 38 as a solidifying material, but the inner space 25 may be filled with a solidifying material other than concrete, such as mortar. In short, any material that fills the inner space 25 in a fluid state and is then solidified can be used as the solidifying material.

- In the above-described embodiment, the flood prevention wall 10 is provided in an annular shape so as to surround the building 11, but the flood prevention wall 10 does not necessarily have to be provided in an annular shape. For example, if there is a portion such as a hill on one side of the building 11 that is higher than the ground surface, the flood prevention wall 10 may be arranged in a U-shape in plan view so as to surround the building 11 together with that portion. . In this case as well, the building 11 can be prevented from being flooded.

- In the above-described embodiment, the flood prevention wall 10 is provided to prevent the building 11 from being flooded.

10 Flood prevention wall 11 Building as flood prevention object 20 Waterproof block as a wall body 21 Opposing plate part as one opposing plate part 22 Opposing plate part as the other opposing plate part 23... Upper plate part, 25... Inner space as inner wall space, 29... Opening, 30... Steel sheet pile as support, 31... Bolt as fastening member and opening suppressing member, 38... Filling as solidifying material concrete.

Claims (9)

A flood prevention wall that prevents flooding to a building or other target to be prevented from flooding by being erected above the ground,
Equipped with multiple walls arranged side by side in the width direction,
The wall has a pair of opposing plate portions facing each other in the thickness direction of the wall,
In-wall spaces opened at least at both ends in the width direction and downward are formed between the opposing plate portions,
a support that is driven into the ground and whose upper end side enters the wall space from below;
a solidifying material that fills the intra-wall space and binds the support and the wall,
The solidifying material is a flood prevention wall provided across the inner wall space of the adjacent wall bodies. The flood prevention wall according to claim 1, wherein the support is a steel sheet pile extending in a direction in which the walls are arranged. 3. The flood prevention wall according to claim 1, wherein each of said walls has an upper plate portion which connects upper end sides of said pair of opposing plate portions and covers said inner wall space from above. 4. The flooding according to claim 3, wherein the upper plate portions of the adjacent wall bodies are formed such that openings for opening the inner wall space upward are formed at the boundaries of the adjacent wall bodies. preventive wall. Each of the walls has an opening suppressing member positioned below the upper plate to suppress opening of the opposing plates when the space inside the wall is filled with the solidifying material. 5. A flood prevention wall according to claim 3 or 4, provided. The opening suppressing member is an elongated fastening member,
A first hole through which the fastening member is inserted is formed in one of the opposing plate portions, and
a second hole through which the fastening member is inserted is formed in the support;
The fastening member is provided through the first hole and the second hole in a fastening hole provided in the other opposing plate portion of the respective opposing plate portions or outside the other opposing plate portion. 6. The flood prevention wall according to claim 5, which is fastened to a fastened member. The other opposing plate portion is provided facing an outer region, which is a region on the opposite side of the water immersion prevention target across the water immersion prevention wall,
7. The flood prevention wall according to claim 6, wherein said other opposing plate portion is provided with said recessed fastening hole opened only to said inner wall space. A construction method for constructing the flood prevention wall according to any one of claims 1 to 7,
a support driving step of driving the support into the ground;
a wall installation step of installing the wall in a state in which the upper end side of the support is inserted into the inner wall space;
a solidifying material filling step of filling the intra-wall space with the solidifying material in a fluid state and then solidifying;
In the step of filling the solidifying material, the method of constructing a flood prevention wall includes filling the solidifying material across the inner wall space of the adjacent wall bodies. A precast concrete wall constituting the flood prevention wall according to claim 6 or 7,
The pair of opposing plate portions forming the inner wall space, and the upper plate portion covering the inner wall space from above,
A wall body made of precast concrete, wherein the first hole is formed in one of the pair of opposing plate portions, and the fastening hole is formed in the other opposing plate portion.

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